在树脂自硬砂的试验和应用中,混砂设备是很重要的。混砂过程中,从树脂与固化剂接触起,树脂便开始了由稠化到固化的变化;砂子混好之后必须很快用掉,否则将自硬失效。因此,树脂自硬砂的混制,应在尽可能短的时间内完成,而且要随用随混,用多少,混多少。为了防止砂子粉碎而导致树脂砂终强度下降,不宜采用碾压的混砂方式。在树脂自硬砂 In the test and application of resin self-hardening sand, sand mixing equipment is very important. During the sand mixing process, the resin begins to change from thickening to solidification after it comes in contact with the curing agent; the sand must be quickly removed after it is mixed, otherwise it will fail spontaneously. Therefore, the resin mixture of hard sand, should be completed in the shortest possible time, but also with the use with the mix, with how much, mix much. In order to prevent the crushing of sand and resin resulting in decreased final strength of sand, sand mixing should not be used rolling method. In the resin self-hardening sand